<!doctype html>
<style>
* { margin: 8; padding: 0; }
div {
	position: absolute;
	top: 50px;
	left: 50px;
	outline: 50px solid rgba(0,0,255,0.5);
	background: rgba(0,0,255,0.5);
	width: 1px;
	height: 1px;
}
</style>
<div></div>